Massive list of free certificates and badges for developers in data science, software development, and more.

Update (April 2026): On April 9, shareholders of both companies voted overwhelmingly to approve the merger — 99.4%% at Coursera, 99.9%% at Udemy. The deal is expected to close in the second half of 2026. I also dug into the 300-page merger prospectus and found that Coursera approached Udemy three times over two years before getting a yes, and that Pluralsight’s owner made a competing cash offer. Read the full merger history. TL;DR Coursera is acquiring Udemy in an all-stock deal worth ~$1.8 b

Not just courses — podcasts & webinars too, with free certificates & continuing medical education credit.

Here are the best free online courses to learn OCaml, a general-purpose, statically-typed programming language that is widely used in academia and research institutions.